[Option] Mark getLastArg(NoClaim) as noinline.

After #156730,
getLastArg(NoClaim) are now just below the inlining threshold and
inlining them causes +0.44% code size increase for Clang and a
corresponding compile-time increase without helping compile-time.

Mark them as noinline to recover the original codesize.

http://llvm-compile-time-tracker.com/compare.php?from=a271d07488a85ce677674bbe8101b10efff58c95&to=3b7b312476da2a2b1fd44815532edf9987da337e&stat=instructions:u

Author: fhahn

llvm/include/llvm/Option/ArgList.h

@@ -254,7 +254,7 @@ class ArgList {
 
   /// Return the last argument matching \p Id, or null.
   template<typename ...OptSpecifiers>
-  Arg *getLastArg(OptSpecifiers ...Ids) const {
+  LLVM_ATTRIBUTE_NOINLINE Arg * getLastArg(OptSpecifiers ...Ids) const  {
     Arg *Res = nullptr;
     for (Arg *A : filtered(Ids...)) {
       Res = A;
@@ -266,7 +266,7 @@ class ArgList {
   /// Return the last argument matching \p Id, or null. Do not "claim" the
   /// option (don't mark it as having been used).
   template<typename ...OptSpecifiers>
-  Arg *getLastArgNoClaim(OptSpecifiers ...Ids) const {
+  LLVM_ATTRIBUTE_NOINLINE Arg * getLastArgNoClaim(OptSpecifiers ...Ids) const {
     for (Arg *A : filtered_reverse(Ids...))
       return A;
     return nullptr;